GATE is an all-in-one checkout rules app that blocks invalid checkouts and lets you show, hide, or reorder payment methods and shipping options by condition. Set MOQ and order value limits, restrict products/collections or bundles, and apply customer rules using tags, login status, email, and destination country. Start fast with templates and a no-code builder. Runs with server-side checkout validation, works with express checkouts like Shop Pay and PayPal, and requires no theme edits.